What stud conversion is every one running

[repoman89]

IMO, yes. They will stick out past the face of the front wheel by quite a bit. FCP does have 44mm studs that they say work with OE wheels and no spacers.

I don't see how those could possibly be long enough. I can run 12-15mm spacers max with my 78mm studs before the end of the lug nut starts to lose thread. That means the stud should be about 63mm minimum. 19mm shorter on top of that is almost another inch!

Anyway I really distrust my thread-in studs, even replacing them annually so far. Stories about stud conversion failure on track driven BMWs are far too widespread for me to feel comfortable with them at high speeds and high brake and turning forces. Probably going to switch to the Core4 hubs before going on track again.

[repoman89]

Why are studs easier to snap than bolts if they are the same diameter? is it related to the material used or the fact that the stud + lug nut mechanism is more prone to play?

i personally use 2 wheel hangers to mount my wheels and replace all my wheel bolts with Rein bolts once I acquire a used car and just never torque them to over 90 ft lbs.

Little bit of detail here

https://www.core4motorsports.com/tech

https://www.core4motorsports.com/gallery-of-broken-bmw-wheel-studs

[Slideways]

I don't see how those could possibly be long enough. I can run 12-15mm spacers max with my 78mm studs before the end of the lug nut starts to lose thread. That means the stud should be about 63mm minimum. 19mm shorter on top of that is almost another inch!

Anyway I really distrust my thread-in studs, even replacing them annually so far. Stories about stud conversion failure on track driven BMWs are far too widespread for me to feel comfortable with them at high speeds and high brake and turning forces. Probably going to switch to the Core4 hubs before going on track again.

Yeah, it might be best to check with FCP, but the 75mm APEX studs have a few mm of the hex portion that is not threaded.

[Tbonem3]

The 44mm figure makes sense to me. 44mm would be the stock 25mm length + another 19mm (3/4") for the nut itself to go on. In other words, the entire stock bolt, including the head, should be about 44mm in total length.

It probably comes down to what these companies are including in these lengths - the end of a stud, about 12mm is smooth (bullet nose or allen style). So one company might just mean the length of the threaded portion, but not the end. Another company might be quoting the entire length. A 3rd company could be quoting the threaded portion only, but not including the 12mm or so that threads into the hub (that receives loctite).

[zzyzx85]

I'm using Turner studs on mine. No problems yet. I've had them since 2017 and nearly 100k miles mostly daily driving and 4 track days. I feel like a outlier when I say I've had no issues with them lol.

[Estoril]

I'm using Turner studs on mine. No problems yet. I've had them since 2017 and nearly 100k miles mostly daily driving and 4 track days. I feel like a outlier when I say I've had no issues with them lol.

Sooooo... just waiting for them to fail?

[Nate047]

I'm using Turner studs on mine. No problems yet. I've had them since 2017 and nearly 100k miles mostly daily driving and 4 track days. I feel like a outlier when I say I've had no issues with them lol.

Who's gonna tell hm

[Maxima SE]

Who's gonna tell hm

I will. Don't fix whats not broken !

[bigjae46]

The 44mm studs that FCP sell are way too short. I tried them, would have saved about a lb of unsprung weight per wheel.

Needs to be about 60mm.

[thegenius46m]

Went back to bolts personally after studs backed out on me twice even when torqued to spec and red loctited. Not worth the risk to me. Eventually will do core4 hubs with msi studs but until then, hard pass on the uncertainty of screw in studs. Peace of mind not having to worry anymore about a wheel falling off.

[bjz!]

MRG Titanium

[Estoril]

MRG Titanium

You're brave.

[bigjae46]

I've used Bimmerworld, Turner, APEX, and Vorshlag. I've never hand an issue with a Vorshlag or Bimmerworld stud. Except for BW's ridiculous instructions to install the stud into the wheel hub and torque to 70 ft/lb.

My buddy has had 2 sets of turner studs break. I had an Apex stud break after 6 months.

I stick with Vorshlag just from my personal experiences.

[George Hill]

Running bolts, no studs, but have a set of the Core4 press in stud conversion hubs here for the car when the suspension gets refreshed.

[bjz!]

You're brave.

I doubt you guys take almost half bad back roads and put tyres outside the tarmac like me, and, still 0 problems. So, stop being dramatic about studs, thanks.